使用方法：

1、head引入css文件

<link href="css/style.css" rel="stylesheet" type="text/css"/>

2、head引入js文件

<script src="js/jquery-1.7.2.min.js"></script>

3、body引入HTML代碼

<div style="height:400px;"></div> <!--  滾動顯示 里面的內容 默認需要在“pattern-box”上面加上高度 需向下滑動 才可顯示內容 -->
<div class="pattern-box">
	<div class="pattern-head">
		<h2>多種多樣的商業盈利模式</h2>
	</div>
	<div class="pattern-wrap">
		<div class="pattern-list">
			<div class="pattern-item item-1">
				<div class="pattern-item-title">
					<img src="images/app-store-biz1.png" about="" title="" alt="">
					<h3>自營電商</h3>
				</div>
				<p>適用于各行各業電商買賣<br>服裝、生鮮、電器、家居等</p>
			</div>
			<div class="pattern-item item-2">
				<div class="pattern-item-title">
					<img src="images/app-store-biz2.png" about="" title="" alt="">
					<h3>招商入駐</h3>
				</div>
				<p>打造網上綜合商場<br>入駐費、傭金折扣、廣告費</p>
			</div>
			<div class="pattern-item item-3">
				<div class="pattern-item-title">
					<img src="images/app-store-biz3.png" about="" title="" alt="">
					<h3>O2O營銷</h3>
				</div>
				<p>線上線下聯動營銷<br>線上預約／買單，線下消費</p>
			</div>
			<div class="pattern-item item-4">
				<div class="pattern-item-title">
					<img src="images/app-store-biz4.png" about="" title="" alt="">
					<h3>付費閱讀</h3>
				</div>
				<p>打造各行業新聞自媒體<br>集聚粉絲，付費閱讀</p>
			</div>
			<div class="pattern-item item-5">
				<div class="pattern-item-title">
					<img src="images/app-store-biz5.png" about="" title="" alt="">
					<h3>付費發布</h3>
				</div>
				<p>二手、招聘、房產、寵物等<br>用戶付費發布相關信息</p>
			</div>
		</div>
	</div>
</div>

<div style="height:200px;"></div>

<script type="text/javascript">

var $mod = $(".pattern-box");
document.addEventListener('scroll',function(){
	//滾動條高度+視窗高度 = 可見區域底部高度
	var visibleBottom = window.scrollY + document.documentElement.clientHeight;
	//可見區域頂部高度
	var visibleTop = window.scrollY;
	for (var i = 0; i < $mod.length; i++) {
		var centerY = $mod.eq(i).offset().top+($mod.eq(i).outerHeight()/2);
		//console.log($mod.eq(i).outerHeight());
		if(centerY>visibleTop&¢erY<visibleBottom){
			$mod.eq(i).addClass("show");
			//console.log('第'+i+'個區域可見');
		}else{
			//$mod.eq(i).removeClass("show");
			//console.log('第'+i+'個區域不可見');
		}
	}
});
</script>